Kumar, G. ., Shobana, S. ., Nagarajan, D. ., Lee, D. ., Lee, K. ., Lin, C. ., … Chang, J. . (2018). Biomass based hydrogen production by dark fermentation-recent trends and opportunities for greener processes. Current Opinion in Biotechnology, 50, 136-145. https://doi.org/10.1016/j.copbio.2017.12.024 (Original work published 2018)